That was simpler than I thought. I was able to add a directive (if that's the right term) like "DENY xxx.yyy.zzz.aaa" for the address. directly to the httpd.conf file in etc/apache2. For some reason, all the other references I had seen were saying to refer to files inside other files and defined elsewhere, yadda yadda. Hopefully this will work. Seems a lot more direct that other methods at least.